Everything from the action-packed trailer to the freshly announced episode title—“Beyond the Wall”—hints that this Sunday’s episode of Game of Thrones will be another epic, snowy brawl between good and evil, in the vein of the Season 5 classic “Hardhome.” But while a meme-happy Internet is prepared for the frosty, zombie-smashing adventures of Jon Snow, Tormund Giantsbane, the Hound, Beric Dondarrion, Thoros of Myr, Jorah Mormont, and Gendry Waters, there may be an even more intriguing fight simmering in the background.

A set of twelve newly released photos from HBO feature plenty of snow-filled action, including that already-iconic shot of Beric Dondarrion and his flaming lightsa—I mean, sword.

But while the Lord of Light-blessed weapon burns brightly in the Land of Always Winter, there are also shots of favorite characters who have been left behind to keep the home fires burning. Daenerys and Tyrion (Missandei is still mysteriously M.I.A.) look suitably worried back at Dragonstone.

Even Daenerys’s children look concerned about that suicide mission up North. They had grown awfully fond of Jon Snow, after all.

But the conflict I’m personally most excited about has nothing to do with mythic beasts or fantastical monsters. Game of Thrones is always at its very best when it focuses on human drama; think, for example, about the dramatically fraught encounter between Jaime and Tyrion Lannister in Episode 5. And this season in particular has been well-positioned to bring the audience conflicts where we’re not sure which side to root for. Think again of Jaime Lannister—only this time, picture him charging directly at Daenerys Targaryen. Combine those two moments, and you might approximate the very explosive potential of a showdown, seven seasons in the making, between Arya and Sansa Stark. Last week’s slightly confusing letter reveal means there’s nowhere to go but down for the sisters Stark.

What could be more relatable than a sibling rivalry between two women who barely know each other anymore, and fall too easily back on old squabbling patterns? I think we’re all hoping that these two can find some common ground (their initial reunion was so sweet)—but if they don’t, then I’m not sure which sister we should bet on. Arya may have magical assassin skills, but Sansa has survived a lot to make it this far. I wouldn’t want to be on the bad side of either of them. Maybe Jon was smart to head beyond the Wall instead of back home.